Workflow to build and release the current tag.

This only runs on tags that include this file, so
it won't run on any upstream tags, but only on tags
into which this has been merged/cherry-picked.

.github/workflows/release.yml

@@ -0,0 +1,60 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+  # This second trigger covers the case where you
+  # delete and recreate from an existing tag
+  release:
+    types:
+      - created
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install toolchain
+        run: |
+          sudo apt-get update && sudo DEBIAN_FRONTEND=noninteractive apt-get install -y make git xz-utils
+      # per README.md, building needs Go 1.17 and Node LTS
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '^1.17' # The Go version to download (if necessary) and use.
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 'lts/*'
+
+      - name: Build Release Assets
+        # The officially releases use 'make release' (https://github.com/neuropoly/gitea/blob/65e42f83e916af771a51af6a3f8db483ffa05c05/.drone.yml#L772)
+        # but that does cross-compilation (via docker (via https://github.com/techknowlogick/xgo))
+        # which is overhead and complication I don't need or want to deal with.
+        #
+        # Instead, just do native Linux compilation then pretend we did 'make release'.
+        run: |
+          TAGS="bindata sqlite sqlite_unlock_notify" make build
+          mkdir -p dist/release
+          cp -p gitea dist/release/gitea-$(git describe --tags --always)-linux-amd64
+
+      - name: Compress Release Assets
+        run: |
+          xz -k dist/release/*
+
+      - name: Checksum Release Assets
+        # each release asset in the official build process gets a separate .sha256 file
+        # which means we need a loop to emulate it
+        run: |
+          (cd dist/release; for asset in *; do sha256sum $asset > $asset.sha256; done)
+
+      - name: Upload Release
+        # this Action creates the release if not yet created
+        uses: softprops/action-gh-release@v1
+        with:
+          # We don't have .drone.yml's pretty changelog
+          #  generator, so just zero-out the release notes
+          body: ''
+          files: 'dist/release/*'
+          fail_on_unmatched_files: true